I LOVE PISTACHIOS. And not because they're one of the lowest calorie nuts. They just taste awesome. I practically hugged my mom when she surprised me with a giant bag of pistachios all in little single-serving packages.
I know the packages I have have less than 40 in them and are 130 calories each.
I found
this article on livestrong that says 25 pistachios is 100 calories. This is great for me because I also have a big bag of pistachios...now I can make my own serving bags!